Mode of arranging the lamps and reflectors of lighthouses to prevent



y -2Sht-Sht1' A. -FOLGER. aes ee Reflector.

Pate nted March 218, 1842..

4 2 Sheets-Sheet 2. A. FOLGER.

Refiector. No .2,520.s 7 Patented March 28, 1842.

n, arena mmwen Washington. n.c.

NITED STATES PATENT oFFIoE.

AARON FOLGER, OF NANTUCKET, MASSAOHUSETTS.

MODE OF ARRANGING- THE LAMPS AND REFLECTORS OF LIGHTHOUSES TO PREVENT THE EFFECT OF FROST ON THE SURFACE OF THE LANTERN.

Specification of Letters Patent No. 2,520, dated March 28, 1842.

To aZZ whom t may concem:

Be it known that I, AARON FOLGER, of Nantucket, county of Nantucket, and State of Massachusetts, have invented a new and Improved Mode of Lighting Lighthouses which I call the American Plan; and 1 do hereby declare that the ollowing is a full and eXact description of the improvement, which I claim as my invention and which I desire to Secure by Letters Patent.

It consists lnostly in placing the lanips as near the glass of the lantern as the ronts of the reflectors will let them come in the mam ner described in this specification, the lamps and refiectors being connected together in the same manner as they are in the lights and placed on slides. To do this I Would have a shelf or plate of iron all around the lantern as represented n drawing A, the lap of the plate to be at the corners of the lantern, as in drawing D. Sheet iron such as is used for steam bo-ilers is suitable for the plate which is to be raised on legs, as in drawing B. I would place each lamp on a Slide, as in drawing B, and each slide to turn on a pivot, that being the screW that confines the slide to the plate marked in the* drawing F the screw about three-fourths of an inch in diameter With a round head the circular plate for the slide 7% inches in diameter and five-eighths of an inch thick Where the pieces are placed that support the lamps, which pieces are to be firmly fiXed in the slide, the screw to have a thn plate under the head and a Square nut under the plate to move between pieces to prevent its a turning and a nut under that to prevent the screw s turning.

The height of the supporters of the plate cannot be fiXed until they are wanted. The height of the supporters of the lamps about 15 inches from the Slide to the piece the lamps hook to which is marked in the drawing 1. To find the height for the legs of the plate and fiX the places in the plate to govern the slides place the lamps on the slides and the slides on the plate and raise i the plate on bloc'kings to its place so as to bring the lights in the center of the glass. Then you can find the height of the legs and mark the places 011 the plate to govern the slides. As represented in drawing D they are to be parallel to a line from each corner post to the center of the lantern. The plate ought to be nearly level the places so as to draw the lamps back far enough to turn the refiectors clear of the glass. \When the lamps are lighted they are to be advanced untl the refiectors strike the sash.

The blank circles on the drawing B are the places* for lamps if there is more than one tier wanted. One full tier is 16 lamps; two tiers, 24: lamps. The supporters of the lamps in the upper tier must be like the figure in the drawing marked Gr; the legs of the plate like that marked H; the slide with the supporters of the lamp *marked E; the plate apout 17 inches wide. The circular plate for the slide may be of brass or cast iron the lap of the plate to fasten together with screws like the model.

The nature and eFect of my invention being a great increase of light and prevention by means of radiated and refiected heat from the lamps of ice, snow, and condensation of Vapor.

What I claim is- The following Viz, the position of the lamps in such contiguity to the glass of the lantern as will keep a temperature to that efiect; this may be done by placing them on any proper line of distance between the glass and siX inches of the glass as the size and shape of the laInps and refiectors may require the distance from the glass being mostly' governed by the size and shape .of the refiectors \and in the manner described in this specification 01' any other manner that is substantially the same.

AARON F OLGER..

Witnesses:

EDWIN GOFFIN, BENJAMIN F. FOLGER. 

